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1 | #include <string.h> |
2 | #include "sh2.h" |
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3 | #include "compiler.h" |
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4 | |
5 | #define I 0xf0 |
6 | |
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7 | SH2 *sh2; // active sh2 |
8 | |
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9 | int sh2_init(SH2 *sh2, int is_slave) |
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10 | { |
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11 | int ret = 0; |
12 | |
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13 | memset(sh2, 0, sizeof(*sh2)); |
14 | sh2->is_slave = is_slave; |
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15 | #ifdef DRC_SH2 |
16 | ret = sh2_drc_init(sh2); |
17 | #endif |
18 | return ret; |
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19 | } |
20 | |
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21 | void sh2_finish(SH2 *sh2) |
22 | { |
23 | #ifdef DRC_SH2 |
24 | sh2_drc_finish(sh2); |
25 | #endif |
26 | } |
27 | |
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28 | void sh2_reset(SH2 *sh2) |
29 | { |
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30 | sh2->pc = p32x_sh2_read32(0, sh2); |
31 | sh2->r[15] = p32x_sh2_read32(4, sh2); |
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32 | sh2->sr = I; |
33 | sh2->vbr = 0; |
34 | sh2->pending_int_irq = 0; |
35 | } |
36 | |
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37 | void sh2_do_irq(SH2 *sh2, int level, int vector) |
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38 | { |
39 | sh2->irq_callback(sh2->is_slave, level); |
40 | |
41 | sh2->r[15] -= 4; |
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42 | p32x_sh2_write32(sh2->r[15], sh2->sr, sh2); /* push SR onto stack */ |
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43 | sh2->r[15] -= 4; |
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44 | p32x_sh2_write32(sh2->r[15], sh2->pc, sh2); /* push PC onto stack */ |
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45 | |
46 | /* set I flags in SR */ |
47 | sh2->sr = (sh2->sr & ~I) | (level << 4); |
48 | |
49 | /* fetch PC */ |
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50 | sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2); |
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51 | |
52 | /* 13 cycles at best */ |
53 | sh2->cycles_done += 13; |
54 | // sh2->icount -= 13; |
55 | } |
56 | |
57 | void sh2_irl_irq(SH2 *sh2, int level) |
58 | { |
59 | sh2->pending_irl = level; |
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60 | if (level > sh2->pending_int_irq) |
61 | sh2->pending_level = level; |
62 | else |
63 | sh2->pending_level = sh2->pending_int_irq; |
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64 | |
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65 | sh2->test_irq = 1; |
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66 | } |
67 | |
68 | void sh2_internal_irq(SH2 *sh2, int level, int vector) |
69 | { |
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70 | // FIXME: multiple internal irqs not handled.. |
71 | // assuming internal irqs never clear until accepted |
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72 | sh2->pending_int_irq = level; |
73 | sh2->pending_int_vector = vector; |
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74 | if (level > sh2->pending_level) |
75 | sh2->pending_level = level; |
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76 | |
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77 | sh2->test_irq = 1; |
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78 | } |
79 | |